Alert archive / Wyoming / Blizzard Warnings in 2021
Blizzard Warning 4, NWS Cheyenne, WY
NWS Cheyenne, WY issued this blizzard warning at Dec 10, 2021, 2:48 PM MST for 4 counties in Wyoming. It took effect at Dec 10, 2021, 8:00 PM MST. It was in force for 30 hr. 4 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Dec 10, 2021, 2:48 PM MST (21:48 UTC)
- In effect from
- Dec 10, 2021, 8:00 PM MST
- Expired
- Dec 12, 2021, 2:27 AM MST
- In force
- 30 hr
- Issued by
- NWS Cheyenne, WY
Counties Albany County, WY, Carbon County, WY, Laramie County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 88 km from the middle of the area, began a volume at 21:49 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Dec 10, 11:34 PM MST | BLIZZARD | 1 Nnw Arlington, WY | WYDOT SENSOR AT ARLINGTON RECORDED FREQUENT WIND GUSTS > 35 MPH WITH VISIBILITIES UNDER 1/4 MILE BETWEEN 0816 PM AND 0100 AM. PEAK WIND GUST 71 MPH WITH 0.07 MILE VISIBILITY. 3-HOUR CRITERIA MET AT 11:34 PM. |
| Dec 11, 2:50 AM MST | BLIZZARD | 7 Ese Arlington, WY | WYDOT SENSOR AT COOPER COVE RECORDED FREQUENT WIND GUSTS > 35 MPH WITH VISIBILITIES UNDER 1/4 MILE BETWEEN 1150 PM AND 350 AM. PEAK WIND GUST 75 MPH WITH 0.18 MILE VISIBILITY. 3-HOUR CRITERIA MET AT 2:50 AM. |
| Dec 11, 8:10 AM MST | BLIZZARD | Bordeaux, WY | WYDOT SENSOR AT BORDEAUX RECORDED FREQUENT WIND GUSTS 60 TO 80 MPH WITH VISIBILITY NEAR 1/4 MILE BETWEEN 0500 AM AND 0800 AM. PEAK WIND GUST 95 MPH AT 0722 AM. I-25 IS ALSO CLOSED BETWEEN CHEYENNE AND WHEATLAND DUE TO WINTER CONDITIONS. |
| Dec 11, 11:00 AM MST | BLIZZARD | 1 Ene Rawlins, WY | WYDOT REPORTS VIA STATE/COUNTY TROOPERS OF WHITEOUT CONDITIONS OVER THE PAST 3 HOURS. WIND GUSTS OF 35-50MPH HAVE BEEN RECORDED AT THE RWL ASOS BETWEEN 1500Z-1800Z. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 9.8 hours before the alert went out and 278 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 788 m above ground
- 0-6 km bulk shear
- 78 kt
- 0-1 km storm-relative helicity
- -70 m²/s²
- 0-3 km storm-relative helicity
- -37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
194 WWUS45 KCYS 102148 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 248 PM MST Fri Dec 10 2021 WYZ106-111200- /O.CAN.KCYS.WS.W.0018.000000T0000Z-211211T0000Z/ /O.NEW.KCYS.BZ.W.0004.211211T0600Z-211211T1800Z/ Central Laramie Range and Southwest Platte County- Including the city of Bordeaux 248 PM MST Fri Dec 10 2021 ...BLIZZARD WARNING IN EFFECT FROM 11 PM THIS EVENING TO 11 AM MST SATURDAY... ...WINTER STORM WARNING IS CANCELLED... * WHAT...Blizzard conditions expected. Winds gusting as high as 75 mph. * WHERE...Between Wheatland and Chugwater including Bordeaux. * WHEN...From 11 PM this evening to 11 AM MST Saturday. * IMPACTS...Widespread blowing snow could significantly reduce visibility and create whiteout conditions. The hazardous conditions could have large impacts on the morning commute. The cold wind chills as low as 15 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ NEZ002-003-095-096-WYZ101-102-107-108-116-102300- /O.CAN.KCYS.WS.W.0018.000000T0000Z-211211T0000Z/ Dawes County-Box Butte County-Northern Sioux County- Southern Sioux County-Converse County Lower Elevations- Niobrara County-East Platte County-Goshen County- South Laramie Range- Including the cities of Chadron, Chadron St Park, Alliance, Hemingford, Harrison, Agate, Douglas, Glenrock, Bill, Deer Creek, Lusk, Redbird, Wheatland, Guernsey, Torrington, Buford, Pumpkin Vine, and Vedauwoo 248 PM MST Fri Dec 10 2021 ...WINTER STORM WARNING IS CANCELLED... Periods of snow showers can be expected through early this evening. However, little if any additional snowfall accumulation is expected. Gusty winds will continue to cause drifting snow tonight. $$ NEZ019>021-WYZ117>119-102300- /O.CAN.KCYS.WW.Y.0040.000000T0000Z-211211T0000Z/ Scotts Bluff County-Banner County-Morrill County- South Laramie Range Foothills-Central Laramie County- East Laramie County- Including the cities of Scottsbluff, Gering, Harrisburg, Angora, Bridgeport, Bayard, Redington, Whitaker, Federal, Horse Creek, Cheyenne, and Pine Bluffs 248 PM MST Fri Dec 10 2021 ...WINTER WEATHER ADVISORY IS CANCELLED... A few snow showers are still possible through sunset. However, little if any additional snowfall accumulation is expected. Gusty winds will cause some blowing and drifting of snow during the remainder of the afternoon into the evening. $$ WYZ110-111200- /O.NEW.KCYS.BZ.W.0004.211211T0300Z-211212T0000Z/ North Snowy Range Foothills- Including the cities of Arlington and Elk Mountain 248 PM MST Fri Dec 10 2021 ...BLIZZARD WARNING IN EFFECT FROM 8 PM THIS EVENING TO 5 PM MST SATURDAY... * WHAT...Blizzard conditions expected. Winds gusting as high as 65 mph. * WHERE...Between Arlington and Elk Mountain * WHEN...From 8 PM this evening to 5 PM MST Saturday. * IMPACTS...Widespread blowing snow will cause significant reduction in visibility and whiteout conditions. The cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WYZ109-111200- /O.NEW.KCYS.BZ.W.0004.211211T0600Z-211212T0000Z/ Central Carbon County- Including the city of Rawlins 248 PM MST Fri Dec 10 2021 ...BLIZZARD WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 PM MST SATURDAY... * WHAT...Blizzard conditions expected. Winds gusting as high as 60 mph. * WHERE...Rawlins, Sinclair and Hannah * WHEN...From 11 PM this evening to 5 PM MST Saturday. * IMPACTS...Widespread blowing snow will cause significant reduction in visibility and whiteout conditions. The cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
5 follow-up statements
952 WWUS45 KCYS 111252 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 552 AM MST Sat Dec 11 2021 WYZ110-120000- /O.CON.KCYS.BZ.W.0004.000000T0000Z-211212T0000Z/ North Snowy Range Foothills- Including the cities of Arlington and Elk Mountain 552 AM MST Sat Dec 11 2021 ...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Blizzard conditions likely. Winds gusting as high as 85 MPH. * WHERE...Interstate 80 near Arlington and Elk Mountain. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Widespread blowing snow will cause significant reduction in visibility and whiteout conditions. The cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WYZ109-120000- /O.CON.KCYS.BZ.W.0004.000000T0000Z-211212T0000Z/ Central Carbon County- Including the city of Rawlins 552 AM MST Sat Dec 11 2021 ...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Blizzard conditions possible. Winds gusting as high as 60 mph. * WHERE...Central Carbon County especially east of Rawlins. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Widespread blowing snow will cause significant reduction in visibility and whiteout conditions. The cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WYZ106-111800- /O.CON.KCYS.BZ.W.0004.000000T0000Z-211211T1800Z/ Central Laramie Range and Southwest Platte County- Including the city of Bordeaux 552 AM MST Sat Dec 11 2021 ...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 11 AM MST THIS MORNING... * WHAT...Blizzard conditions expected. Winds gusting as high as 85 MPH. * WHERE...Bordeaux along Interstate 25 between Chugwater and Wheatland. * WHEN...Until 11 AM MST this morning. * IMPACTS...Widespread blowing snow could significantly reduce visibility and create whiteout conditions. The hazardous conditions could have large impacts on the morning commute. The cold wind chills as low as 15 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ CLH
988 WWUS45 KCYS 111747 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 1047 AM MST Sat Dec 11 2021 WYZ106-120000- /O.EXT.KCYS.BZ.W.0004.000000T0000Z-211212T0000Z/ Central Laramie Range and Southwest Platte County- Including the city of Bordeaux 1047 AM MST Sat Dec 11 2021 ...BLIZZARD WARNING NOW IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Blizzard conditions expected. Winds gusting as high as 85 MPH. * WHERE...Bordeaux along Interstate 25 between Chugwater and Wheatland. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Widespread blowing snow could significantly reduce visibility and create whiteout conditions. The cold wind chills as low as 15 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WYZ110-120000- /O.CON.KCYS.BZ.W.0004.000000T0000Z-211212T0000Z/ North Snowy Range Foothills- Including the cities of Arlington and Elk Mountain 1047 AM MST Sat Dec 11 2021 ...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Blizzard conditions likely. Winds gusting as high as 85 MPH. * WHERE...Interstate 80 near Arlington and Elk Mountain. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Widespread blowing snow will cause significant reduction in visibility and whiteout conditions. The cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WYZ109-120000- /O.CON.KCYS.BZ.W.0004.000000T0000Z-211212T0000Z/ Central Carbon County- Including the city of Rawlins 1047 AM MST Sat Dec 11 2021 ...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Blizzard conditions possible. Winds gusting as high as 60 mph. * WHERE...Central Carbon County especially east of Rawlins. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Widespread blowing snow will cause significant reduction in visibility and whiteout conditions. The cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
296 WWUS45 KCYS 112102 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 202 PM MST Sat Dec 11 2021 WYZ110-120100- /O.EXT.KCYS.BZ.W.0004.000000T0000Z-211212T1200Z/ North Snowy Range Foothills- Including the cities of Arlington and Elk Mountain 202 PM MST Sat Dec 11 2021 ...BLIZZARD WARNING NOW IN EFFECT UNTIL 5 AM MST SUNDAY... * WHAT...Blizzard conditions likely. Winds gusting as high as 85 MPH. * WHERE...Interstate 80 near Arlington and Elk Mountain. * WHEN...Until 5 AM MST Sunday. * IMPACTS...Widespread blowing snow will cause significant reduction in visibility and whiteout conditions. The cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WYZ109-120100- /O.EXT.KCYS.BZ.W.0004.000000T0000Z-211212T1200Z/ Central Carbon County- Including the city of Rawlins 202 PM MST Sat Dec 11 2021 ...BLIZZARD WARNING NOW IN EFFECT UNTIL 5 AM MST SUNDAY... * WHAT...Blizzard conditions possible. Winds gusting as high as 60 mph. * WHERE...Central Carbon County especially east of Rawlins. * WHEN...Until 5 AM MST Sunday. * IMPACTS...Widespread blowing snow will cause significant reduction in visibility and whiteout conditions. The cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WYZ106-120000- /O.CON.KCYS.BZ.W.0004.000000T0000Z-211212T0000Z/ Central Laramie Range and Southwest Platte County- Including the city of Bordeaux 202 PM MST Sat Dec 11 2021 ...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Blizzard conditions expected. Winds gusting as high as 80 MPH. * WHERE...Bordeaux along Interstate 25 between Chugwater and Wheatland. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Widespread blowing snow could significantly reduce visibility and create whiteout conditions. The cold wind chills as low as 15 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
094 WWUS45 KCYS 120013 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 513 PM MST Sat Dec 11 2021 WYZ106-120115- /O.EXP.KCYS.BZ.W.0004.000000T0000Z-211212T0000Z/ Central Laramie Range and Southwest Platte County- Including the city of Bordeaux 513 PM MST Sat Dec 11 2021 ...BLIZZARD WARNING HAS EXPIRED... Local areas of blowing snow reducing visibilities down to one mile will be possible overnight through early Sunday morning along I-25 and area roadways from Chugwater to Wheatland. Ground blizzard condition chances have decreased and thus the warning has been allowed to expire. High winds will continue overnight while the snow begins to crust over and become slightly less blowable to cause local impacts. $$ WYZ110-121200- /O.CON.KCYS.BZ.W.0004.000000T0000Z-211212T1200Z/ North Snowy Range Foothills- Including the cities of Arlington and Elk Mountain 513 PM MST Sat Dec 11 2021 ...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 5 AM MST SUNDAY... * WHAT...Blizzard conditions. Winds gusting as high as 80 mph. * WHERE...Interstate 80 near Arlington and Elk Mountain. * WHEN...Until 5 AM MST Sunday. * IMPACTS...Widespread blowing snow will cause significant reduction in visibility and whiteout conditions. The cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WYZ109-121200- /O.CON.KCYS.BZ.W.0004.000000T0000Z-211212T1200Z/ Central Carbon County- Including the city of Rawlins 513 PM MST Sat Dec 11 2021 ...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 5 AM MST SUNDAY... * WHAT...Blizzard conditions. Winds gusting as high as 65 mph. * WHERE...Central Carbon County especially east of Rawlins. * WHEN...Until 5 AM MST Sunday. * IMPACTS...Widespread blowing snow will cause significant reduction in visibility and whiteout conditions. The cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
818 WWUS45 KCYS 120927 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 227 AM MST Sun Dec 12 2021 WYZ109-110-121030- /O.CAN.KCYS.BZ.W.0004.000000T0000Z-211212T1200Z/ Central Carbon County-North Snowy Range Foothills- Including the cities of Rawlins, Arlington, and Elk Mountain 227 AM MST Sun Dec 12 2021 ...BLIZZARD WARNING IS CANCELLED... Areas of blowing snow will remain possible today. However, blizzard conditions are no longer expected. $$ CLH
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 10, 2:55 PM MST | High Wind Warning | CYS | Albany, Carbon, Converse, Laramie, Platte | 50 hr |
Nearby
Blizzard Warnings in Wyoming, 2021Every blizzard warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.